Casting for fireplace heat exchanger



FIG. 1 is a perspective view of a casting for fireplace heat exchanger showing our new design;

FIG. 2 is a plan view thereof;

FIG. 3 is a side elevational view thereof, the side of the casting not shown herein is a mirror image thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof; and

FIG. 6 is a bottom view thereof. 

The ornamental design for a casting for fireplace heat exchanger, as shown and described. 